At the present time Delve gear maxes out at Tier 8, and drop Hero Class gear, but you can’t get Gilded Crests unless you get lucky on a Tier 8 Bountiful Delve. Why not let players who do Tiers 9 through 11 get Gilded Crests as rewards. I have a tone of Hero class gear but it will never go beyond 619 at the rate Gilded crests are dropping in Tier 8s.
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